#9: prompt user to enter values
#9: minor spacing change
#9: renamed class_definitions.py -> definitions_class.py
#9: fix, and import definitions_variable.py
#9: define definitions_variable.py file
#9: minor comment fix to refer to least_common_ancestor.py
#9: change variable to tuple
#9: user chooses to input or use input.txt
#9: add values to list item 'tree_value'
#9: initialize list variable, data_tree
#9: properly define data_root, and data_tree
#9: prompt user for lca node values
#9: remove duplicate 'root' defn, initiliaze 'data_lca'
#9: new line on initial input
#9: remove unnecessary list() wrapper around data_tree value
#9: add 'possible_quit' variable to definitions_variable.py
Merge pull request #13 from jeff1evesque/alternative_input

#9: alternative input